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WO2009103245A1 - Appareil et système de surveillance et de réglage d'un réverbère à del - Google Patents

Appareil et système de surveillance et de réglage d'un réverbère à del Download PDF

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Publication number
WO2009103245A1
WO2009103245A1 PCT/CN2009/070504 CN2009070504W WO2009103245A1 WO 2009103245 A1 WO2009103245 A1 WO 2009103245A1 CN 2009070504 W CN2009070504 W CN 2009070504W WO 2009103245 A1 WO2009103245 A1 WO 2009103245A1
Authority
WO
WIPO (PCT)
Prior art keywords
emitting diode
light emitting
street
control circuit
light source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2009/070504
Other languages
English (en)
Inventor
Chak Lam Peter Yip
King Chung Vamco Tsoi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tri Concept Tech Ltd
Original Assignee
Tri Concept Tech Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tri Concept Tech Ltd filed Critical Tri Concept Tech Ltd
Priority to EP09713184A priority Critical patent/EP2258148A1/fr
Priority to US12/918,818 priority patent/US20110001626A1/en
Priority to CN2009801142613A priority patent/CN102017803A/zh
Publication of WO2009103245A1 publication Critical patent/WO2009103245A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/16—Controlling the light source by timing means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/175—Controlling the light source by remote control
    • H05B47/185—Controlling the light source by remote control via power line carrier transmission
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/175—Controlling the light source by remote control
    • H05B47/19—Controlling the light source by remote control via wireless transmission
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the present invention relates to an apparatus and system for monitoring and controlling street lighting.
  • the street lamp is an important public facility in the city, On top of providing lighting for pedestrians, it also prevents criminals from committing crimes in dark.
  • the present invention in one aspect is a lighting apparatus for street illumination, which includes an LED light source, a control circuit which is connected to said LED light source, a power supply connected to power line and supplying electrical power to the LED light source and the control circuit, and a PLC transceiver electrically coupled to the control circuit and the power line.
  • the control circuit controls electrical power supplied to the LED light source.
  • a street lighting system includes a plurality of LED street lamps, each said LED street lamp contains an LED light source, a control circuit connected to said LED light source, and a PLC transceiver connected to the control circuit.
  • Each LED street lamp is assigned with a unique identification code; and an electrical distribution network is electrically connected to and supplies electrical power to each LED street lamp.
  • a central controller is connected to the electrical distribution network via a second PLC transceiver. The central controller controls and
  • each LED street lamp connected to the electrical distribution network by sending control commands to each street lamp and receives status information therefrom via the second PLC transceiver.
  • the luminance of the LED street lamp can be adjusted or the LED street lamp can be switched on or off according to the ambient light.
  • This is due to the intelligent control by the control circuit inside the LED street lamp, which can control the LED light according to information feedback from various sensors.
  • the control circuit can also protect the LED light by reducing the current supplied to the LED light when there is an overheating situation detected by the diagnostic circuit inside the LED street lamp.
  • Another advantage provided by the present invention is the ability of centralized controlling of multiple LED street lamps via a PLC network.
  • all the LED street lamps are connected to the electrical distribution network via a PLC modem.
  • a central controller which is also equipped with a PLC modem can then send various control commands to every LED street lamp via the electrical distribution network.
  • This configuration provides huge convenience and saves lots of manpower for controlling and monitoring street lamps scattered over a large geographical area.
  • the PLC network also enables additional functions such as security surveillance.
  • FIG. 1 is a block diagram of the apparatus of an LED street lamp in one embodiment.
  • FIG. 2 is a block diagram of the apparatus of an LED street lamp in another embodiment.
  • FIG. 3 is a structural diagram of an LED street lamp system in one embodiment.
  • FIG. 4 is a structural diagram of an LED street lamp system utilizing Internet in one embodiment.
  • FIG. 5 is a structural diagram of an LED street lamp system utilizing wireless communication in one embodiment.
  • FIG. 6 shows the use of an LED street lamp with cameras as a part of a surveillance system.
  • LED light emitted diode
  • An LED street lamp consumes only a quarter of the power of a traditional sodium vapor lamp. Moreover, it can last much longer - at least 50,000 hours. This reduces substantial amount of maintenance work in lamp replacement. Also, the time to turn on or off an LED lamp is significantly shorter than that of the sodium vapor lamp, not to mention the on/off delay of the mercury vapor lamp.
  • the current invention recognizes that not only LED lamps are more energy efficient, but also their electronic mode of operation results in the ability to control lighting systems down to the individual lamp, resulting in much better control and efficiency if the necessary components are incorporated into the system as described below.
  • the first embodiment of the present invention is an LED street lamp with a self-diagnosis function and remote access capability.
  • the LED street lamp comprises an LED light source 50, a control circuit 20, a power supply 24, a Power Line Communication (PLC) modem 22, a lamp socket 23 and a diagnostic circuit 26.
  • the control circuit 20 connects to the other parts in the apparatus as a central control unit.
  • the control circuit 20 comprises a microcontroller 32, a Read Only Memory (ROM) 34, a Random Access Memory (RAM) 36, and external ports 38, whose functions will be introduced later.
  • the power supply 24 provides both the constant current for the LED light source 50, and the working voltage for the control circuit 20.
  • Each street lamp is provided with a unique identification code so that it can be uniquely identified by a remote, central controller. In one embodiment, the unique identification code is stored in the ROM 34.
  • the PLC modem 22 which is a type of transceiver, enables the control circuit to connect to the PLC network.
  • PLC is a data communication technology whereby the data is modulated onto the Alternative Current (AC) wave of the electrical power system.
  • AC Alternative Current
  • the power line not only supplies power to the equipments such as street lamp but also serves as a carrier for data transmission.
  • the PLC modem 22 is the device that extracts from or injects data to the power line.
  • both the electricity power and the data communication are linked to the distribution network via the lamp socket 23 when the LED street lamp 21 is mounted on a lamp pole.
  • the diagnostic circuit 26, which comprises a current sensor 28 and a temperature sensor 30, monitors the operation of the LED light source 50 and provides a warning signal if an unusual condition is detected.
  • the PLC modem 22 receives an incoming data packet sent by the central controller via the PLC network, the PLC modem 22 will first demodulate the data signal from the power line and send the information to the control circuit 20.
  • the data packet comprises at least one unique identification code of the street lamps, a command for the street lamp to execute, and optionally some parameters associated with that command.
  • the control circuit 20 then examines the unique identification code. If this matches that of the street lamp, the control circuit 20 then executes the command.
  • the command may be either to switch on the street lamp, to switch it off, or to modify its luminance to a value specified by the parameters.
  • the control circuit 20 then controls the power supply 24 that supplies power to the LED light source 50.
  • control circuit 20 of an individual street lamp 21 can also send status information together with its unique identification code via the PLC modem 22 back to the central controller, so that the central controller can monitor the well-being of each individual street lamp 21.
  • all the components, including the electronic parts mentioned above, of the LED light source 50 can be made to the same dimension of a conventional street lamp so that it can fit to the existing street lamp socket and housing. As such, by replacing existing street lamps with the LED street lamps 21, and by adding the computer server and the corresponding PLC modem at the server end, an operator can instantly control and monitor each individual street lamp within the network.
  • the power supply 24 provides electrical power to both the LED light source 50 and other circuits in the apparatus.
  • a Pulse Width Modulation (PWM) current source is used within the power supply 24 to provide PWM current to the LED.
  • a special driving circuit that includes an inductor is also designed so that the driving current needs not drop to zero.
  • each LED lamp can independently adjust its brightness.
  • the control circuit 20 adjusts the luminance by sending out control signal to the power supply 24 to adjust the pulse width of the supply current.
  • the control circuit 20 can be programmed to do it independently, or it does so upon receiving a command from a central controller. This is a substantial advantage over existing street lamp system whereby an expensive and bulky controller is needed to install along the roadside to control a group of street lamps.
  • the diagnostic circuit 26 contains a luminance sensor 27, a current sensor 28 and a temperature sensor 30.
  • the sensors in the diagnostic circuit 26 are used to detect the state element of the LED street lamp 21. Such state elements include but not limited to luminance, current or temperature.
  • the luminance sensor 27 is a direct means for monitoring the luminance of the environment as well as the LED light source 50.
  • the current sensor 28 monitors the current sent to the LED light source 50 to prevent it from over-supplying and burning the LED light source 50.
  • the tern- perature sensor 30 monitors the overall temperature within the enclosure of the LED street lamp 21 and specifically the temperature of the LED light source 50.
  • the temperature sensor 30 in the diagnostic circuit 26 will detect that the temperature of the LED street lamp 21 is irregularly high.
  • the diagnostic circuit 26 will then send a warning signal to the control circuit 20, which then send control signal to the power supply 24 to reduce the PWM current so as to protect the LED lamp from overheating.
  • the street lamp itself can adjust the LED immediately without the intervention of a remote central controller.
  • the control circuit 20 may also report the abnormality to the central server so that a maintenance crew can be deployed to investigate. This self-diagnosis, self-rectifying and self-reporting feature can greatly relieve the burden of the maintenance unit and at the same time reduce the failure rate of the street lamps.
  • the LED street lamp 21 further comprises various peripheral devices, which can communicate with external parties through the PLC network.
  • one or more cameras 40 may be installed on street lamp poles to monitor the real-time traffic on the road and send the captured information to a central system via the power line for further use.
  • many types of environmental sensors 42 detecting atmosphere information such as sunlight radiation, temperature, humidity, air pressure, wind speed, wind direction, air quality, etc, may be installed in the LED street lamp 21 to provide environmental sensing ability to the street lamps. The sensor data can then be transmitted via the power line to a central server for further analysis.
  • each LED street lamp 21 within the PLC network is connected to the electrical distribution network 66 which supplies electricity to street lamps.
  • the structure of the PLC network is thus the same as the electrical distribution network 66.
  • each LED street lamp 21 is assigned with a unique identification code, which can be identified and individually communicated by the central controller 60.
  • the central controller 60 is able to activate and control the luminance of each LED street lamp 21, or control multiple LED street lamps 21 at the same time. With this arrangement, street lamps along a street need not be turned on or off at the same time, but the brightness of each of them can be individually controlled to balance between sufficient luminance on the street and overall power saving.
  • this embodiment takes an advantage of the power line infrastructure as the media for supplying power and transmitting data. There is no need to add additional hardware to the existing street lamp poles.
  • the cost of establishing a centralized monitoring and control network is kept to minimum - a computer server that acts as a central controller and a PLC modem at the server end that serves as a bridge for data communication to individual street lamp 21. Yet the benefit of such a network is fully realized.
  • the LED street lamp 21 is able to operate in a standalone mode without the need of the central controller.
  • the LED street lamp 21 that is equipped with the luminance sensor 27 can switch itself on when the sensor detects that the ambient light is below a pre-determined threshold. Likewise, it can adjust its luminance according to the environment. For example, when the luminance sensor 27 detects that the ambient light is higher than another predetermined threshold, the control circuit will set the LED street lamp 21 to dimming mode by adjusting the current supplied to the LED street lamp 21. This will save electrical power.
  • the street lamps 21 are networked together as mentioned before, each individual street lamp 21 can also operate on its own. Under normal circumstances, the street lamps 21 are under the control of the central controller. However, when the central controller 60 fails to operate, the individual street lamp 21 takes control to switch itself on or off, or adjust its luminance. This prevents the undesirable scenario that a single failure at the central controller or control point may cause the entire group of street lamps to become in-operative.
  • the street lamp system in the present invention has overcome the shortcoming of existing street lamp system, which is based upon manual inspection and replacement of individual street lamp.
  • This manual procedure is labor intensive, time consuming and costly.
  • one approach to reduce the failure rate is to replace the street lamps before their life-expectance runs out. Though this premature replacement can reduce the failure rate, it leads to suboptimal use of street lamp resources.
  • signs of potential failure in each street lamp can be individually detected, which reduces the need of the premature replacement procedure.
  • each LED street lamp 21 is further connected to a PLC Internet gateway 62 while the central controller 60 is coupled to the Internet 52.
  • the PLC Internet gateway 62 serves as a data communication bridge between the central controller 60 and the street lamps 21. This enables the central controller 60 to monitor and control street lamps across a wide metropolitan area, or even across different cities. The administration of street lamps can thus be focused and centralized by the aid of the Internet 52.
  • each street lamp 21 is equipped with a wireless module that can communicate to the central controller 60 either directly or through a public wireless network.
  • the wireless technology can be, but not limited to, dedicated wireless radio, cellular network. Wireless Local Area Network (WLAN), or Bluetooth, ultra wide band (LWB ), Zigbee, or WiMAX technologies.
  • a typical LED street lamp 21 in a residential area is equipped with at least one camera 40 which captures the snap-shot images or continuous video of the vehicles 80 and pedestrians 82 on the street.
  • This configuration saves tremendous effort and costs in deploying separate cameras in the area to monitor traffic or a high secure zone where surveillance is needed.
  • the captured image or video can be instantly sent to a remote control center via the PLC network.
  • a speed radar gun can also be installed on the street lamp pole to capture vehicles on a road that travel at a speed exceeding a pre-defined threshold, and then send relevant information to the police station via the PLC network.
  • control circuit 20 comprises a microcontroller 32 with ROM 34 and RAM 36
  • ASIC application-specific integrated circuit
  • the diagnostic circuit 26 may include not only the current sensor or temperature sensor but also circuitries to perform other diagnostic functions.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention porte sur un réverbère à DEL qui comprend un modem PLC et un circuit de commande. Ledit réverbère à DEL peut recevoir des instructions de réglage en provenance d'une télécommande, et il peut également effectuer un autoréglage sur la base d'informations d'état collectées par un circuit de diagnostic. L'invention concerne également un système de surveillance et de réglage de réverbère à DEL qui comprend un contrôleur central, un réseau de distribution et une pluralité de réverbères à DEL. La technologie PLC permet, à l'aide d'un contrôleur central, de procéder au réglage centralisé de chaque réverbère à DEL.
PCT/CN2009/070504 2008-02-22 2009-02-23 Appareil et système de surveillance et de réglage d'un réverbère à del Ceased WO2009103245A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP09713184A EP2258148A1 (fr) 2008-02-22 2009-02-23 Appareil et système de surveillance et de réglage d'un réverbère à del
US12/918,818 US20110001626A1 (en) 2008-02-22 2009-02-23 Apparatus and system for led street lamp monitoring and control
CN2009801142613A CN102017803A (zh) 2008-02-22 2009-02-23 监察和控制led路灯的设备和系统

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US3057208P 2008-02-22 2008-02-22
US61/030,572 2008-02-22

Publications (1)

Publication Number Publication Date
WO2009103245A1 true WO2009103245A1 (fr) 2009-08-27

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PCT/CN2009/070504 Ceased WO2009103245A1 (fr) 2008-02-22 2009-02-23 Appareil et système de surveillance et de réglage d'un réverbère à del

Country Status (4)

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US (1) US20110001626A1 (fr)
EP (1) EP2258148A1 (fr)
CN (1) CN102017803A (fr)
WO (1) WO2009103245A1 (fr)

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